Presented by Vanarin Suvattipunth Vanarin Suvattipunth 18 May 2009 Asian Institute of Technology.
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Transcript of Presented by Vanarin Suvattipunth Vanarin Suvattipunth 18 May 2009 Asian Institute of Technology.
FEASIBILITY OF USING PULSED ULTRA VIOLET STERILIZATION FOR MILK PACKAGING
CONTAINERS
Presented by Vanarin Suvattipunth
18 May 2009Asian Institute of Technology
PRESENTATION OUTLINE
Introduction
PUV sterilization mechanism
PUV regulation & optimization
Study procedure and its results
Conclusion
INTRODUCTION Packaging containers sterilizing technique
Thermal treatmenttechnique
Non-thermal treatment
technique
Chemical injection technique
Non-chemical (alternative) technique
Autoclave
Long/Short period heat treatment
Optimization of using PUV sterilization with target milk bottle integrated optimization treatment
Theoretical calculation approach of dispersion action
Objectives of the study
Electric line
in
AC/DC convert
er
Capacitor
banks
Pulse formin
g (switc
h)
Flashlamp
Target
Low-power,Low-voltage,
Low AC continuous current
Low-power,High-voltage,
Low DC continuous current
Low-power,High-voltage,
High DC continuous current
High-power,High-voltage,
High DC pulse current
PUV STERILIZATION MECHANISM
Sunshine versus Lightning bolt
Energy deliver mechanisms
1200 Watt-Seconds TotalSingle Pulse3 millisecond Pulse Width
1200 Watt-Seconds TotalMulti Pulse Train, 100 Watt-seconds/Pulse1 millisecond Pulse Width
1200 Watt-Seconds TotalContinuous UV Light
30 45 60 75 90 105 120
10
100,000
400,000
PE
AK
PO
WE
R (
Watt
s)
Time (Seconds)
1 m
s
12
ms
Power delivering mechanism of PUV
International regulation [FDA: CFR179.45-sp/b]
Cumulative fluence 120 kJ/m2
Pulse duration < 2 msWavelength range 200-1,000 nm
Boundaries[reference sources]200- 1,000 nm Wavelength range
0.001 ms to 0.1 ms Pulse duration0.1 to 5 s (recm. 2 s) Cool down duration
less than 50 OC Surface temp. control
PUV Regulations & Optimizations
Craters around spores formed by sinking of heated spores into the PET substrate
STUDY PROCEDURE AND ITS RESULTS
2-D drawing CAD model Mesh model
Dutch Mill ® 200 cc pasteurized milk bottle
Clark (13 kJ/m2) Wekhof & Dunn (40 kJ/m2)
Mimouni (90 kJ/m2) FDA (120 kJ/m2)0
20
40
60
80
100
120
140
MinimumMaximum
Tem
pera
ture
(oC
)
Optimum PUV treatment for target milk bottle
5
15
25
35
45
55
65
75
85
Mean temp Maximum temp HDPE service temp
Tem
pera
ture
(O
C)
First flash First cool down time (CDT)
Second flash Second CDT Third flash
Mean temp 35.605 35.609 46.188 46.21 56.7960000000001
Maximum temp 56.291 46.478 77.407 64.485 95.214
HDPE service temp
85 85 85 85 85
5
15
25
35
45
55
65
75
85
95
Mean temp Maximum temp HDPE service temp
tem
pera
ture
(O
C)
1st Flash 1st CDT 2nd Flash 2nd CDT 3rd Flash
Max temp 56.291 34.38 55.218 42.188 62.994
Average temp 35.576 27.897 38.452 30.842 41.394
HDPE service temp 85 85 85 85 85
5
15
25
35
45
55
65
75
85
Max tempAverage tempHDPE service temp
Study steps
Tem
pera
ture
(oC
)
Microorganisms dispersion action from PUV treatment
Define solid angle
Define the force from radiation pressure
Define the initial velocity
of treated microorganisms
0 10 20 30 40 50 60 70 80 90 1000.000E+00
2.000E-05
4.000E-05
6.000E-05
8.000E-05
1.000E-04
1.200E-04
1.400E-04
1.600E-04
1.800E-04
Clark (13000 J/m2)Dunn & Wekhof (40000 J/m2)Mimouni (90000 J/m2)FDA (120000 J/m2)
Attack angle (deg.)
Radia
tion p
ressure
(P
a)
0 10 20 30 40 50 60 70 80 90 1000.00
100.00
200.00
300.00
400.00
500.00
600.00
Clark (13000 J/m2)Dunn & Wekof (40000 J/m2)Mimouni (90000 J/m2)FDA ((120000 J/m2)
Attack angle (deg.)
Velo
cit
y (
mm
/s)
Result of calculations
CONCLUSION
Sterility achievement
Key point for the packaging development
Various applications of PUV for packaging field
Spores of Aspergillus Niger
Spores of Basillus Subtilis